tadeja commented on code in PR #51404:
URL: https://github.com/apache/arrow/pull/51404#discussion_r4163913027


##########
python/pyarrow/tests/test_pandas.py:
##########
@@ -5006,7 +5006,7 @@ def test_does_not_mutate_timedelta_dtype():
 
     assert np.dtype(np.timedelta64) == expected
 
-    df = pd.DataFrame({"a": [np.timedelta64()]})
+    df = pd.DataFrame({"a": [np.timedelta64(0, "s")]})

Review Comment:
   Fyi, @AlenkaF  @jorisvandenbossche, running 
`test_does_not_mutate_timedelta_dtype()` on current PR but with 
[pre-13553](https://github.com/apache/arrow/pull/13553/changes#diff-d16c6f82df0c35bc3791cd26cd4107c20d5c7532d5c7ff9737d701aa9b65dc4bL170)
 `if (type == NPY_DATETIME) {` then both asserts pass - shouldn't that fail? 
   But with these changes (what you @AlenkaF had just before 
https://github.com/apache/arrow/commit/a148c139ca6d8d498c06ecd9f6d0aa0d78da48a2)
   ```diff
    def test_does_not_mutate_timedelta_dtype():
   -    expected = np.dtype('<m8[s]')
   +    expected = np.dtype('m8')
    
   -    assert np.dtype(np.timedelta64(0, "s")) == expected
   +    assert np.dtype(np.timedelta64) == expected
    
        df = pd.DataFrame({"a": [np.timedelta64(0, "s")]})
        t = pa.Table.from_pandas(df)
        t.to_pandas()
    
   -    assert np.dtype(np.timedelta64(0, "s")) == expected
   +    assert np.dtype(np.timedelta64) == expected
   ```
    at least second assert does (correctly) fail :shrug:
   



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